add fieldpoc systemd-service

modules/fieldpoc/default.nix

@@ -11,11 +11,18 @@ in {
   options = {
     services.fieldpoc = {
       enable = mkEnableOption "fieldpoc";
-      # TODO: config
-      #config = mkOption {
-      #  type = with types; attrsOf anything;
-      #  default = { };
-      #};
+      ommIp = mkOption {
+        type = types.str;
+      };
+      ommUser = mkOption {
+        type = types.str;
+      };
+      ommPasswordPath = mkOption {
+        type = types.path;
+      };
+      sipsecretPath = mkOption {
+        type = types.path;
+      };
     };
   };
 
@@ -24,6 +31,48 @@ in {
       python3.pkgs.fieldpoc
     ];
 
+    systemd.services.fieldpoc = {
+      description = "Simple phone system";
+      wantedBy = [ "multi-user.target" ];
+      after = [ "network-online.target" "yate.service" ];
+
+      serviceConfig = {
+        Type = "simple";
+        ExecStart = "${pkgs.python3.pkgs.fieldpoc}/bin/fieldpoc -c /etc/fieldpoc/config.json -e /etc/fieldpoc/extensions.json --debug";
+        ConfigurationDirectory = "fieldpoc";
+      };
+
+      preStart = let
+        cfgFile = pkgs.writeText "config.json" (lib.generators.toJSON { } {
+          controller = {
+            host = "127.0.0.1";
+            port = 9437;
+          };
+          dect = {
+            host = cfg.ommIp;
+            username = cfg.ommUser;
+            password = "!!OMMPASSWORD!!";
+            sipsecret = "!!SIPSECRET!!";
+          };
+          yate = {
+            host = "127.0.0.1";
+            port = 5039;
+          };
+          database = {
+            hostname = "127.0.0.1";
+            username = "fieldpoc";
+            password = "fieldpoc";
+            database = "fieldpoc";
+          };
+        });
+      in ''
+        ${pkgs.gnused}/bin/sed -e "s/!!OMMPASSWORD!!/$(cat ${cfg.ommPasswordPath})/g" -e "s/!!SIPSECRET!!/$(cat ${cfg.sipsecretPath})/g" ${cfgFile} > /etc/fieldpoc/config.json
+        if [ ! -f "/etc/fieldpoc/extensions.json" ]; then
+          echo '{"extensions": {}}' > /etc/fieldpoc/extensions.json
+        fi
+      '';
+    };
+
     services.postgresql = {
       enable = true;
       initialScript = pkgs.writeText "backend-initScript" ''